Engine valve mechanism.



- %Z1esses L H. COBB.

ENGINE VALVE MECHANISM;- 'APPLICATION man SEPT 11. 1913.

jhven iot 'zggmarzfi Patented AprQ20, 191 5.

UN TED STATES PATENT onnicn.

LYMAN H. COBB, F FITGHBURG, MASSACHUSETTS, ASSIGNOR TO MARY ELIZABETH JOHNSON, TRUSTEE UNDER THE WILL OF IVER JOHNSON, OF FITCHBURG, MASSA- CHUSETTS.

ENGINE yALvE MECHANISM.

Specification of Letters Patent.'- Patented Apr. 20, 19 15.

Original application filed December 11, 1911, Serial No. 665,054. Divided and this application filed September '11, 1913. Serial No. 789,389. 1

* Fitchburg,

Commonwealth of Massachusetts, have in- T all whom it may concern:

Be it known that .I, LYMAN H. Gone, a citizen of the United States, residing at in the county of l/Vorcester and vented a new and useful Improvement in combustion engines. 6 common for the stem of the.

,gases from they pass the valve Engine Valve Mechanism, of 'which thefo lowing,

665,054, filed Decembenll,

relates to engine Yvalve particularly to mecha- .Myv invention mechanism and more nis'm' for protecting valves-from the action of heat and corrosive substances.

considerable injury to the stem if ,unprotected." 1 6 One object of the invention, therefore, is to provide an improved form ofprotection for a valve stem which is exposed to the injurious effects'of heat "or corrosion caused are exposed 'to the injurious effects of-heat V by surrounding substances such as exhaust ases. w A While valve vine charnsm constructed 1n, accordance with yjjinventi'on seemspartlcularly, applicable in connection with internal combustion; engines, it is obvious that the construction may be advantageouslin con-.

nection withf'any valves, the stems of which Other objects and advantages will appear from the following description taken'in connection with the accompanylng drawings, in

which the figure represents an elevation partly insection ofan internal combustion engine of that type commonly used upon motorcycles. i V The form of invention shown in the drawing includes acylinder 1 inclosing a piston 2 which drives a crank 9 carried by the cam together .with"" the accompanying drawing, is a specification. 'l' This application is a division of my application for patent on internal combustioii 'en gine, Serial No.

exhaust from the cylinder 1. a

guided in a bearing the: stems of engine The upper end a flange 15 surrounding stem must, in time, cause the bearing only slightly affected by tions of the exhaust gases. shaft 3 by'me'ans of aeonriectingrod 4, the crank shaft 3 carrying a driving pulley 5 3 A worm gear 6 on the crank shaft 3 drives a second worm gear 7 on the cam shaft 8 so as to rot the cam cam 9 causes the tappet -10 to reciprocate vertically so as to lift the valve stein 11, the

valvei'stem and tappet toward-the cam as soon aslth'e raised portion of the cam haspassedfio nf beneath the tappeta The r'eciprocation of the -valve stem 1L causes the valve 13, securedtoitsupper end, to6pen and-close at proper intervals to control the The valve, stem 11 is 14 driven into an opening in the frame of the'engine so as to be supported by friction. of the bearing 14 is extended as far as possible-toward the valve 13 without interfering with the proper seating ofv the valve so that, when the valve is fully seated, the upper end of the.' bearing will surround and protect all that portion of the valve stem which is not protected by the valve itself. The valve 13 is provided with the upper end of 14 so as to afford additional protection to that portion of the valve stem ly- Zing within the exhaust port. One of the -main features of this flange large enough to leave a space 16 between its inner surface and the protecting upper end of the bearing 14. The flange 15' is also s'ufliciently long to overlap considerably the upper end of the bearing 14 when the valve has been fully opened by the cam 9.

froin the cylinder 1 shaft. Rotation of the compression spring '12 serving to return the 15 is that it is' I When the highly heated and usually cor- .rosive exhaust gases pass through the exhaust port 17 after the" valve- 13 has been opened, they come into contact with "the outer surface. of the flange .15.v This flange, as well as the valve 13 andthe bearing '14, may be made from some material, such" as high carbon steel, which. is the surrounding gases, although it is desirable that the valve stem 11 be constructed of a low carbon steel, or some other material adapted to withstand the shocks imparted to it by I the cam 9, such materials being much. more subject to injury fromtheheating and corroding acof the space 16 is closed so that the surrounding gases cannot enter it to any ap- The-upper end a from the flange 15 through the upper end of the bearing 14 tojthe valve stem. It is Well known that gas isapoor conductor of heat the space 16 acts and the layer of gas within as an efficient heat insulator surrounding the valve stem. Although the or distort the flange slightly,.this can obvious that their tails of one form ters Patent is:

have'no effect upon the valve stem because of the intervening space 16.

While the upper end of the" bearing 14 isshown as lying Within the flange 15,

versed if desired Without interfering with the function of the intervening insulating space 16 and such reversal may be desirable under certain conditions.

While I have shown and described the deof my invention, I .do not 'Wish to be limited to such details as changes may be made Without departing from the spirit of the invention; but

I -Iaving described my invention, What I,

claim as new and desire to secure by Let- 1. Engine valve mechanism including a valve provided with a stem, a bearing for the valve is open. The,

heat may Warp tion of the outer member lVitnessesz sulating layer serving to prevent access of heat to the valve stem by conduction.

2. Engine valve mechanism including a valve provided with a stem, a bearing for the stem, and a flange extending from the valve, the flange and the adjacent end of the stem overlapping and being spaced apart to form an' layer serving to prevent access of heat to the I valve stem it is positions might be -rethe stem, and a flange extending'from the 'valve, the flange and the adjacent-end of the bearing overlapping with one outside the other to form a telescopic joint, there being a space'between the overlapping porof the joint and the stem to prevent access of heat to the stem by. conduction. v

Dated this eighth day of September 1913.

LYMAN' H. ooBB.

Burns B. FOWLER, j PENELOPE COMBERBAGH.

insulating layer, the insulating 

